checking which sp is installed on exchange 2007 and installing sp3

We are currently running Exchange 2007 on an SBS2008 single server. We are having trouble with one of our clients running Outlook 2007, in as much as it keeps asking for a username and password for "Remote" and "SBS2008". We have tried all, but the only way we have found to use Outlook is to click on the cancel button.

Having researched this, I understand that if we install rollup9 or SP2, this should resolve the issue.

This raises a few issues.

Having checked exchange server configurator it states that we are running Version 8.1 build 240.6 with no mention of a service pack at all. Does this mean we do not have any service packs installed, or am I looking in the wrong place.

If we do not have a service pack installed, are we best installing Service Pack 3 now, and do we need to install SP1 and SP2 before we install SP3.

At nearly 900mb, this is some service pack. Can I assume that it is OK to install these on a currenty configured and working exchange server? ie can I presume it will not wipe all of our current users information.

Any advice would be much appreciated.
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nigelbeatsonAsked:
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Glen KnightCommented:
SP2 should fix it but there are also other fixes namely the Kernel Mode authentication option as detailed in my article here: http://www.experts-exchange.com/Software/Server_Software/Email_Servers/Exchange/A_2300-Outlook-continually-prompting-for-username-and-password.html

Running Get-ExchangeServer | fl name, ExchangeVersion

from the Exchange Management Shell will provide the version number.

Exchange 2007 RTM = 8.0.685.25
Exchange 2007 SP1 = 8.1.240.6
Exchange 2007 SP2 = 8.2.176.2
Exchange 2007 SP3 = 8.3.083.6
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Glen KnightCommented:
Forot to answer the rest of your questions.

>>If we do not have a service pack installed, are we best installing Service Pack 3 now, and do we need to install SP1 and SP2 before we install SP3.
No, you can just go straight to SP3, all service packs for Exchange are complete installations.

>>At nearly 900mb, this is some service pack. Can I assume that it is OK to install these on a currenty configured and working exchange server? ie can I presume it will not wipe all of our current users information

Absolutely, it will simply upgrade the existing configuration.
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nigelbeatsonAuthor Commented:
Many thanks.

The script showed that we had no service pack installed, as follows :-

Name                                       :SBS2008
ExchangeVersion                   :0.1 <8.0.535.0>

Would you recommend just installin Sp3 straight onto this?
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Glen KnightCommented:
Absolutely, just go straight for SP3
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DraxonicCommented:
demazter is quite correct and has provided you with great information.

Just one thing:
I would recommend you backup your server before doing a service pack upgrade.

Just in case.
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nigelbeatsonAuthor Commented:
Fantastic! SP3 fully installed and working. Resolved my original problem too! Thanks to all.
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